Discharge-door for cyanid-tanks.



Patented Aug. a, |901.

No. eao,|54.

A. D. JANSEN. DISCHARGE D008 FR CYANID TANKS.

(Application filed July 5, 1899 2 shee'ts-sheet 2.

Model.)

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.4 TTORNEYS UNITED STATES PATENT OFFICE;

ALEXANDER DUNCAN JANSEN, OF JOHANNESBURG, SOUTH AFRICAN REPUBLIC.

DISCHARGE-.DOOR FOR CYANlD-TANK'S.

SPECIFICATION forming part of Letters Patent No. 680,154, dated August 6, 1901. Application iiled July .5, 1899. Serial No. 722,872. (No model.)

To all whom t may concern.-

Be it known that I, ALEXANDER DUNCAN JANSEN, a subject of the Queen of Great Britain and Ireland,and a resident at Royal Cham-l bers, Simmonds street, Johannesburg, in the South African Republic, have invented certain new and useful Improvements in and Relating to Discharge-Doors for Cyanid-Tanks, of which the following is a specification.

This invention relates to improvements' connected with discharge-doors of cyanidtanks and the like, and is particularly designed to overcome certain serious defects which exist in the forms at present in general use.

vIn cyanid treatment the sands are subjected I grating or perforated false bottom in order to allow a free passage for the solution which has filtered through. That portion of the tank therefore which is situated over the discharge-door has no grating or filtering matel rial, and consequently a more or less verl-ical column of sands is left in the tank, which still contains cyanid solution with gold in soi lution, the result being that this portion is l filtration takes place in just as complete a imperfectly treated.

The object of this invention is to provide l a door so constructed that a piece of matting Q or filtering material may be placed upon it? in order that the filtration of the solution shall be just as complete over the dischargedoor as in the rest of the tank.

This invention furthermore relates to an improved construction whereby the door is rendered much more easily closed and also tota system of packing the sameby which the joint between the door and the bottom ot' the tank is rendered tight.

The invention will be fully described with the aid of the accompanying drawings, in which- Figure l shows a general plan view of a discharge-door constructed in accordance with the principles of my invention; Fig. 2, a crosssectiona-l view; Fig. 3, a longitudinal elevation,partly in section; Fig. 4, an enlarged view showing in end sectional elevation the construction of retainingcatch and bolt; Fig. 5, enlarged plan View of retaining-catch.

The shape of the door shown in the drawings referred to is approximately oval or oblong; but my improvements are equally apa plicable to any shape of discharge-doors.

A is aldischarge-door provided on its inside-z'. e., that side which is toward the inside of the tank when the door is closed-v with a series of longitudinal and cross chan*-A vnels or oorrugations B, the level of which when the door is closed corresponds approximately with the level of the grating at the bottom of the tank. y

The door A fits into a seating C, formed in the bottom of the tank, said seating being furnished with an internal Wooden rim C', to which the matting or filtering material D, sit'- uated at the bottom of the tank, is tacked or otherwise secured. v

C2 C2 are grooves or channels to drain off the solution from the channels B into the bot tom of the tank.

The door A is similarly provided with a wooden rim A`l or its equivalent, to which is secured-the piece of matting or ltering material D", which is cut to conform to the shape of the discharge-door. By this construction manner over the discharge-door as in other parts of the tank, the solution filtering through the medium D into the channels or corrugations B, whence it drains through the channels C2 across the seating C into thebottom of the tank. Y

The door A is hinged, as at E, so as to be readily opened or shut. The hinges are preferably constructed so as to allow a certain amount of vertical play to the door, the tightening of the door being accomplished by the catches F F, the object of this construction being to prevent the hinge offering any resistance to the tightening up of the door.

The door A when shut is retained in position by the series of catches F F, enlarged views of which are shown in Figs. 4 and 5.

IOO

` Each retaining-catch consists of a plate F',

whichswing's'upon the b1t'F2, `which is secured to the seating C, said boltbeing adapted to receive the nut F3, whichr screws upon it.

F4 F4 are locking-screws to prevent any shaking or loosening of the nut F3, the lower portion of the shank of the'bolt beingcut" with four vertical slots F6 equidistant'fromone another around the circumference of the bolt, so as to engage the projecting lockingscrew Without damaging the screw-thread ofy the bolt F2. By providing four slots, as aforementioned, the nut can be locked at every quarter-turn of the nut The face ofthe' retaining-catch F' is wedge-shaped or con.V structed as an incline plane, which is shown by the shaded portion F5 in Figs 4 and, so that as the catches F are turned theyntendto( raise the door in'its seating until it is yperfectly tight. In order toinsure a perfectly tight jointi between the door A and its seating C, 'a' groove or recess G is formed around theline of "thev joint-z'. e., half in the face ofthe doorwandd half in the face of the seating. Within the grooye or recess G thus formed aliexible airtube G' is placed, and when the door A is closed and properly secured said AIiexible tube G is infiated through the valve G2 by means of va force-pump. This forms alpneulnatic packing which effectively prevents leakage.`

The valve G2 may be any suitable air-valve, as found mosticonvenient, the construction of said valve forming no part of this invention.

of such a size that when empty of air it contracts linto the portion of the recess formed` in the door A, so that when the door is opened -the tube is notliable to be torn-bychang against the seating C.

The inner surface of the discharge-door A has been described as formed witha series of channels or corrugations B, and this is the mode of construction which I am inclined to Nconsider bestfIt is evident, however,that

the door may in lieu thereof be provided With -a separate grating or perforated false bottom over which the matting or filtering material is placed.

In order to open the door, the air in the tube G is allowed to escape and the catches AF turned back,.`when the door at once opens.

Having now described my invention, what I claim as new, and desire to secure by Letters An improvedmdischarge door `for cyanidi tanks and the likefprovided onits upper-,side with a series" of channels and cross-channels v]3"over which is Aplaced -a ,piecey of filtering y,meansfor inating samev the whole arranged substantially as hereinbefore described.

:In witness whereof I have hereunto set my hand in presence of two Witnesses. The alr-tube G' is preferably constructed ALEXANDER DUNCAN JANSEN. lWitnesses: u

ADDIE C. GLEAsoN, LOUISE J. BoAz. 

